[jira] [Commented] (YARN-402) Dispatcher warn message is too late

["stefanlee (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16283150#comment-16283150 ] 

stefanlee commented on YARN-402:
--------------------------------

thanks [~djp] our cluster will be very busy between 3.00 a.m. and 7.00 a.m. the event-queue size will be 4000 to 5000, so how can i optimize this?

> Dispatcher warn message is too late
> -----------------------------------
>
>                 Key: YARN-402
>                 URL: https://issues.apache.org/jira/browse/YARN-402
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Lohit Vijayarenu
>            Priority: Minor
>
> AsyncDispatcher throws out Warn when capacity remaining is less than 1000
> {noformat}
> if (remCapacity < 1000) {
>         LOG.warn("Very low remaining capacity in the event-queue: "
>             + remCapacity);
>       }
> {noformat}
> What would be useful is to warn much before that, may be half full instead of when queue is completely full. I see that eventQueue capacity is int value. So, if one warn's queue has only 1000 capacity left, then service definitely has serious problem.



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